KR20030044978A - Optical unit and an image display apparatus using the same - Google Patents

Abstract

PURPOSE: To obtain a single plate optical unit which has a simple constitution and which is efficient in use of light, and a display device. CONSTITUTION: In the unit, light is separated into a multiple number of colors by a dichroic mirror, the multiple number of colors reflected from the dichroic mirror are radiated onto a rotating polyhedron, the multiple number of colors of light emitted from the rotating polyhedron are radiated onto different positions of a display element and by rotating the polyhedron, a color image is projected from a projecting lens by having the light of the multiple number of colors moved in one direction on the display element.

Description

Optical unit and image display device using the same {OPTICAL UNIT AND AN IMAGE DISPLAY APPARATUS USING THE SAME}

The present invention uses a light valve element such as a liquid crystal panel or an image display element to project an image onto a screen, for example, a liquid crystal projector apparatus, a reflective image display projector apparatus, a projection rear projection television, or the like. The present invention relates to an optical engine and a projection image display device, and more particularly, to a technique of irradiating a plurality of colors of light incident on a light valve element to different places of the light valve element using a rotating polyhedron, and sequentially moving and projecting the places. It is about.

Conventionally, light from a lamp is passed through first and second array lenses, a polarizing beam splitter (PBS), and a collimating lens, and then separated into R light, B light and G light using a plurality of dichroic mirrors. The light paths are changed by using the respective rotating prisms, and each light is irradiated to different places of the light valve elements (hereinafter simply referred to as display elements or image display elements), and each light is BACKGROUND ART An optical unit is known in which a place to be irradiated sequentially moves (scrolls) the display element in a predetermined direction.

The conventional optical unit has advantages such as using a display element of a single plate, and is easy to assemble. However, since a large number of rotating prisms must be used, the optical unit becomes large. In addition, since the use of a large number of rotating prisms, a large number of lenses, and a large number of dichroic mirrors is expensive, the use efficiency of light deteriorates because many lenses are used. Moreover, in order to adjust the position on the display element to which R, G, and B light is irradiated, the rotational phase of many rotating prisms must be aligned, and its adjustment is difficult. In addition, there is a problem that a countermeasure against noise caused by using a large number of motors must be taken.

An object of the present invention is to provide a compact and inexpensive optical unit.

Another object of the present invention is to provide a new and useful image display technique that is easy to align a plurality of lights irradiated on a display element and has good light utilization efficiency.

1 is a block diagram showing a first embodiment of an optical unit according to the present invention;

2 is a perspective view of a display element for explaining an irradiation situation of three-color light on the display element;

Fig. 3 is a plan view showing a configuration diagram and a display element showing the second embodiment of the optical unit according to the present invention;

Fig. 4 is a plan view showing a configuration diagram and a display element of a second embodiment of an optical unit according to the present invention;

Fig. 5 is a plan view showing a configuration diagram and a display element showing the second embodiment of the optical unit according to the present invention;

6 is a block diagram showing an embodiment of a display device according to the present invention;

Fig. 7 is a configuration diagram showing a third embodiment of the optical unit according to the present invention.

8 is a configuration diagram showing a fourth embodiment of the optical unit according to the present invention.

9 is a configuration diagram showing a fifth embodiment of the optical unit according to the present invention.

Fig. 10 is a plan view showing a configuration diagram and a display element of a sixth embodiment of an optical unit according to the present invention;

Fig. 11 is a plan view showing a configuration diagram and a display element of a sixth embodiment of an optical unit according to the present invention;

Fig. 12 is a plan view showing a configuration diagram and a display element of a sixth embodiment of an optical unit according to the present invention;

<Explanation of symbols for the main parts of the drawings>

6: imaging lens

8: condenser lens

12: display element

43: reflective rotating polyhedron

47: transmissive rotating polyhedron

In order to achieve the above object, the optical unit includes a light source, a display element for forming an optical image according to an image signal from the emitted light of the light source, and color light separation means for separating the light emitted from the light source into a plurality of colors of light. And light of each of the plurality of colors emitted from the color light separating means is incident, and is emitted by changing the direction of the optical axis to irradiate the plurality of colors of light to different places of the display element, and at the same time, the plurality of colors are irradiated. A rotating polyhedron capable of moving a place in one direction, and a projection device for projecting light emitted from the display element as a color image.

(Example)

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described, referring drawings for several Example.

1 is a configuration diagram showing a first embodiment of an optical unit according to the present invention.

In the figure, the light from the light source 1 obtained by reflecting the light emitted from the lamp with the reflector is incident on the first array lens 2 for forming a plurality of secondary light source images, and also to the plurality of condensing lenses. It is comprised, and it arrange | positions in the vicinity in which many secondary light source images are formed, and passes the 2nd array lens 3 which forms the individual lens image of the 1st array lens 2 in the liquid crystal display element 12. As shown in FIG. P-polarized light and S-polarized light that have passed through the second array lens 3 are mixed by a polarizing beam splitter 4 (hereinafter simply referred to as PBS) and a λ / 2 wave plate 4a. For example, the dichroic mirror 7a for R reflecting the R light and the G reflecting the G light through the first collimated lens 5a and the second collimated lens 5b. The dichroic mirror 7b for reflecting the B light and the B dichroic mirror or reflecting mirror 7c (hereinafter referred to as the dichroic mirror group) reflect the R light, the G light, and the B light, respectively. do. Each of the R light, G light, and B light passes through the third collimating lens 5c and is irradiated to different places of the reflective rotating polyhedron 43, respectively, and reflected by the reflective rotating polyhedron 43. In this embodiment, this reflective rotating polyhedron 43 is composed of an octahedron, but the number of faces is not limited. In the present embodiment, the dichroic mirror groups 7a, 7b, and 7c are three colors of red light (R), green light (G), and blue light (B), and R, G, B, and W (white light). Combination color conversion of, or Y (yellow light), C (cyan light), M (magenta light) combination color conversion, or R, Y, G, C, M combination color conversion, R, O (orange) Light), G, B, and V (purple light) may be combined, and in this case, the dichroic mirror group which is a color separation means may be three or more pieces. In this case, there may be three or more kinds of scroll stands on the display element.

In the case of an optical engine of a two-plate type (a configuration in which two display elements are arranged on two surfaces of the cube-type PBS), only the scrolling light reaches the first display element through the rotating polygon mirror. Light that does not scroll may be configured to reach the second display element directly through the fixed mirror or lens.

When the R light, the G light and the B light are reflected on one side of the reflective rotating polyhedron 43, the optical axes of the respective lights cross once. In addition, when any two of the R light, the G light, and the B light are reflected from one surface of the reflective rotating polyhedron 43, for example, the optical axes of these lights are crossed (Figs. 4 and 5 described later). Reference). The R, G and B light emitted from the reflective rotating polyhedron 43 passes through the imaging lens 6, the condenser lens 8 and the polarizing plate 9a and is reflected by the PBS 10, and then lambda / It is irradiated to the different places of the display element 12 through 4 wave plates 11. The light emitted from the display element 12 and converted from the S-polarized light into the P-polarized light is transmitted through the PBS 10 and further through the polarizing plate 9b, and then through the projection lens 13 to the screen (not shown). Display the enlarged projected image on).

As the display element, there are a transmissive liquid crystal display element, a reflective liquid crystal display element, a ferroelectric liquid crystal display element, and a micromirror image display element, and the like, and any one of these display elements can be suitably used in the present invention. In this embodiment, a reflective liquid crystal display element or a ferroelectric liquid crystal display element can be used as the display element 12.

1, in the optical axis directions of the R light, G light, and B light reflected by the dichroic mirror groups 7a, 7b, and 7c, the R light, the G light, and the B light are respectively displayed as display elements ( 12) is adjusted to be irradiated to a predetermined place. In addition, when the reflective rotary polyhedron 43 is rotated, the size and the number of the polyhedrons are determined so that the R light, the G light and the B light on the display element 12 can move in one direction at approximately the same speed. .

In addition, instead of the dichroic mirror groups 7a, 7b, and 7c, a dichroic prism and a reflection mirror are combined, and the dichroic prism is separated into R light, G light and B light, and the reflection mirror direction of the optical axis. May be controlled.

Next, the irradiation situation on the display element 12 of the R light, G light, and B light reflected by the reflective rotating polyhedron 43 at a certain point of time will be described with reference to FIG.

2 is a perspective view of a display element for explaining an irradiation situation of three-color light on the display element. In Fig. 2, 12R indicates a place where R light is irradiated, 12G indicates a place where G light is irradiated, and 12B indicates a place where B light is irradiated. These R light, G light and B light are irradiated on the display element 12 simultaneously. In addition, 21R, 21G, and 21B are the places where R light, G light, and B light are irradiated next, respectively, and addressing for irradiating R light, G light, and B light is performed. The size of the place is determined by the writing time of the display element 12, that is, the response time and the scrolling speed of the display element 12. Even if the response time is sufficiently shorter than the moving time of one line of the scroll, it is one line. do. If the response time is late, the number of lines matched with the response time is distributed.

When these lights are first irradiated from above by scrolling on the display element 12, addresses are designated for the respective colors in the places 12R, 12G, and 12B, and each color is written in order from the top, Then, the R light, the G light, and the B light are irradiated on the display element 12 in order from above each color area. In the meantime, address writing is performed in places 21R, 21G and 21B. When writing of addresses to the places 21R, 21G, and 21B is completed, the R light, G light, and B light irradiated to the places 12R, 12G, and 12B, respectively, are directed to the place 21R in the downward direction of the display element 12. And 21G, 21B, and R light, G light, and B light are irradiated to these places 21R, 21G, and 21B. When the address writing to the places 21R, 21G and 21B is completed, address writing is performed on the lower line. In this way, the places where the R light, the G light, and the B light are irradiated are sequentially moved downward.

In addition, since the size of each place 12R, 12G, 12B is substantially the same in this embodiment, the shape of each lens of the first array lens 2 has a display element to which R light, G light or B light is irradiated. 12) It is comprised so that it may become a form similar to the large image of the light of place 12R, 12G, or 12B of an image.

Next, a second embodiment of the present invention will be described with reference to Figs.

3, 4, and 5 are plan views showing the construction and display elements of the second embodiment of the optical unit according to the present invention; FIGS. 3 (a), 4 (a), and 5 (a) are FIGS. Denotes a configuration diagram of the optical unit, and FIGS. 3B, 4B, and 5B show locations on the display element to which the R light, the G light, and the B light are irradiated. In the drawing, when the reflective rotating polyhedron 43 is rotating in the direction of arrow A, Fig. 3A shows R light, G light, and B reflected by the dichroic mirror groups 7a, 7b, and 7c. In the case where light is irradiated to one surface of the reflective rotating polyhedron 43, in this case, as shown in FIG. 12R, 12G, and 12B are in order from right to left of (12). 4 (a) shows that R light and G light are irradiated on one surface among the R light, G light and B light reflected by the dichroic mirror groups 7a, 7b and 7c, and B light is irradiated on the next surface. In this case, as shown in Fig. 4B, the locations to which the R light, the G light, and the B light are irradiated are 12B, 12R, and 12G sequentially from the right side of the display element 12. do.

FIG. 5A shows an example in which only R light is irradiated to one surface and light G and B are irradiated to the next surface among the light reflected by the dichroic mirror groups 7a, 7b, and 7c. In this case, as shown in Fig. 5B, the locations to which the R light, the G light and the B light are irradiated are 12G, 12B and 12R in order from the right side of the display element 12.

3 to 5, the same reference numerals as those in FIG. 1 are given the same reference numerals, and description thereof will be omitted. 3 to 5, the point different from that of FIG. 1 is the? / 2 wavelength plate 4a and the second collimate in the optical path from the light source 1 to the dichroic mirror groups 7a, 7b, and 7c. The lens 5b is omitted. In the optical path from the dichroic mirrors 7a, 7b, 7c to the reflective rotating polyhedron 43, the third collimated lens 5c is omitted, and an imaging lens 6a is used instead. In the optical path from the reflective rotating polyhedron 43 to the projection lens 13, the configuration is substantially the same. In this embodiment, it operates in the same manner as in the embodiment of FIG. 1, and irradiates the R light, the G light, and the B light to the places 12a, 12b, and 12c on the display element 12, respectively, and the place is the display element. It is sequentially moved in one direction of (12), and one display element 12 may display a color image on a screen (not shown).

Fig. 3 shows a case in which the R light, the G light and the B light reflected by the dichroic mirror groups 7a, 7b, and 7c are focused on one surface of the reflective rotating polyhedron 43, respectively. In this case, the optical axes of the R light, the G light and the B light reflected from the surface of the reflective rotating polyhedron 43 intersect between the reflective rotating polyhedron 43 and the incident surface of the PBS 10. In this embodiment, the octahedron is described as an example, but the number of faces is not limited thereto.

As shown in Fig. 4, when R light and B light are irradiated on one surface of the reflective rotating polyhedron 43, and B light is irradiated on the next surface, the R and G light reflected by the reflective rotary polyhedron 43 The optical axes are irradiated to the PBS 10 after being crossed, but the optical axes of the B light are incident on the PBS 10 without being mixed with the optical axes of the R light and the G light.

As shown in Fig. 5, when the R light is irradiated on one side of the reflective rotating polyhedron 43, and the G light and the B light are irradiated on the next surface with respect to the rotational direction, next to the reflective rotary polyhedron 43 The G light and the B light reflected from the plane intersect and then enter the incident surface of the PBS 10.

From the above, when multiple colors of light are irradiated on one surface of the reflective rotary polyhedron 43, the optical axes of the multiple-colored light reflected by the reflective rotary polyhedron 43 cross once and then enter the PBS 10. It can be seen that.

Next, an embodiment of the display device according to the present invention will be described.

Figure 6 is a block diagram showing an embodiment according to the present invention. In the drawings, the same reference numerals are given to the same components as those in Figs. 1 and 3 to 5 and the description thereof will be omitted. In this embodiment, the optical path from the light source 1 to the dichroic mirror groups 7a, 7b, and 7c is the same as that of the embodiment of Fig. 1, and the projection lens from the dichroic mirror groups 7a, 7b, and 7c. The optical path up to (13) is the same as the optical path of Figs. Also in the optical unit of this embodiment, since it operates in the same manner as in Figs. 1 and 3 to 5, it is possible to display a color image on a screen (not shown) by the light irradiated from the projection lens 13.

In the embodiment of Fig. 6, 24 is a power supply, 25 is an image display circuit for processing an image signal, 26 is an exhaust fan, which includes an optical unit having an optical path from the light source 1 to the projection lens 13. The display device is constructed by mounting.

Next, using Fig. 7, the direction of the optical path from the light source 1 to the dichroic mirror groups 7a, 7b, and 7c, and the optical path from the reflective rotating polyhedron 43 to the projection lens 13 An embodiment when the directions are the same direction will be described.

Fig. 7 is a configuration diagram showing a third embodiment of the optical unit according to the present invention. In the drawings, the same components as those in the embodiment of Figs. 1 and 3 to 5 are denoted by the same reference numerals and the description thereof will be omitted.

In the figure, the optical path between the light source 1 and the dichroic mirror groups 7a, 7b, and 7c is excluded from the collimating lens 5b of FIG. 2 in the optical path shown in FIG. Is the same. In addition, the optical path from the dichroic mirror groups 7a, 7b, 7c to the reflective rotating polyhedron 43 is excluded from the third collimated lens 5c in the optical path shown in FIG. You may use (5c). Two types of imaging lenses 6a and 6b are used for the optical path from the reflective rotating polyhedron 43 to the PBS 10. After the PBS 10 is configured in the same manner as in FIG. In Fig. 7, the dotted line represents the G light, and the dashed-dotted line represents the optical axis of the G light. Although the optical axes of the R light and the B light are omitted, their optical axes can be represented as shown in FIG.

In the present embodiment, among the three lights reflected by the dichroic mirror groups 7a, 7b, and 7c, light in the middle, that is, G light, is focused on one surface of the reflective rotating polyhedron 43 to form an image. Doing. In this case, since the R light and the B light are irradiated around the G light on the reflective rotating polyhedron 43, the reflective rotating polyhedron 43 is compared with the case where the G light is imaged outside the center of the reflective rotating polyhedron 43. Each side of) can be made small.

In the present embodiment, the projection lens 13 projects projection light of the R light, the G light, and the B light in an optical axis substantially parallel to the optical axis direction of the light of the dichroic mirror groups 7a, 7b, and 7c from the light source 1. You can exit.

Here, the number of collimating lenses is not limited to this, but may be disposed behind the dichroic mirror groups 7a, 7b, and 7c. In addition, the characteristics of the dichroic mirror groups 7a, 7b, and 7c may be replaced so that any case, such as RGB or BGR, may be performed. The first method of reflection is good.

Hereinafter, a fourth embodiment of the optical unit will be described with reference to FIG.

8 is a configuration diagram showing a fourth embodiment of the optical unit according to the present invention. In the figure, light from the light source 1 passes through the first collimating lens 5a and the second collimating lens 5b and then enters the first light pipe 46. The light propagated while reflecting the inner surface of the first light pipe 46 is aligned with the polarization direction by the PBS 45a, the PBS or the total reflection prism or the total reflection mirror 45b, and the λ / 2 wave plate 4b. For example, it enters into the 2nd light pipe 44 as S polarized light. S-polarized light incident on the second light pipe 44 proceeds while reflecting the inside of the second light pipe 44, and the R light, G light, and B light in the dichroic mirror groups 7a, 7b, and 7c, respectively. Is reflected and is incident on the reflective rotating polyhedron 43. Each of the R, G, and B light reflected by the reflective rotating polyhedron 43 passes through the first imaging lens 6a, the second imaging lens 6b, the third imaging lens 6c, and the polarizing plate 9a. It enters into the PBS 10. The subsequent optical path is the same as that in FIG.

Also in this embodiment, a color image can be displayed on the screen. In the present embodiment, the projection light can be emitted from the projection lens 13 in a direction perpendicular to the optical axis of the dichroic mirrors 7a, 7b, and 7c in the light source 1.

In the present embodiment, since the light becomes S polarized light by the PBS 45a and the total reflection prism 45b, between the S polarized light emitted from the PBS 45a and the S polarized light emitted from the total reflection prism 45b. Cracks When these two S-polarized light passes through the second light pipe 44, the two S-polarized light is reflected inside the second light pipe 44, so that the gold generated between the two S-polarized light disappears. Therefore, when not concerned about the gold which generate | occur | produced between two S-polarized light, ie, the 2nd light pipe 44 may be abbreviate | omitted to the light which matched the polarization direction.

In addition, since the light of the width of the light pipe 46 is expanded to approximately twice the width in one direction by the insertion of the PBS 45a, the exit opening shape of the light pipe 44 is similar to the scroll large image on the display element. It is easy to make shape (large rectangular shape). In addition, since the incident opening shape of the light pipe 46 can be designed into a shape suitable for the spot shape of light (for example, a substantially square shape), light can be suppressed without difficulty, and the light can be stretched into a rectangular shape to be shaped. So the efficiency is very good. In addition, since the exit opening shape of the light pipe 44 is imaged again on the display element without providing the rectangular aperture, it is not necessary to cut the light like the rectangular aperture, so the efficiency is good.

In the present embodiment, when the micromirror image display element is used as the display element 12, it is not necessary to orient the polarized light so that the PBS 45a, the total reflection prism or the total reflection mirror 45b, and? / 2 wavelengths are used. The plate 4b becomes unnecessary.

Next, a fifth embodiment of the optical unit according to the present invention will be described.

Fig. 9 is a configuration diagram showing a fifth embodiment of the optical unit according to the present invention, in which only dashed lines show G light, and dashed line shows the optical axis. The optical axis of the other color light becomes the same as in the case of FIG. 1, for example. In addition, in the figure, the same code | symbol is attached | subjected about the element which has the function similar to FIG. 1, and the description is abbreviate | omitted.

In this embodiment, the light from the light source 1 is incident on the first array lens 2 for forming an image composed of a plurality of secondary light sources, and is composed of a plurality of condensing lenses, It arrange | positions in the vicinity which a difference light source image is formed, and passes the 2nd array lens 3 which forms the individual lens image of the 1st array lens 2 in the liquid crystal display element 12. As shown in FIG. The P-polarized light and the S-polarized light, which have passed through the second array lens 3, are mixed into the S-polarized light in the polarization beam splitter 4 and reflect the R light through the first collimated lens 5a. R dichroic mirror 7a, G dichroic mirror 7b that reflects G light, B dichroic mirror or reflecting mirror 7c that reflects B light (this is a UV transmission mirror If it is the structure which reflects R light at last, even if it is an IR light transmission mirror, it is reflected.), And it is reflected as R light, G light, and B light, respectively. Each of the R light, the G light, and the B light is irradiated to different places of the reflective rotating polyhedron 43, and reflected by the reflective rotating polyhedron 43, respectively. R light, G light and B light reflected by the reflective rotating polyhedron 43 pass through the second collimated lens 5b and then reflected by the reflective mirror 16, the optical path of which is changed approximately 90 degrees, It passes through the condenser lens 8. R, G and B light transmitted through the condenser lens 8 are transmitted through the first polarizing plate 9a and reflected by the PBS 10, and are transmitted through the λ / 4 wave plate 11 to reflect the reflective display element ( 12). The R light, G light, and B light converted by the display element 12 into P-polarized light are transmitted through the PBS 10 and emitted through the second polarizing plate 9b. The optical axis emitted from the PBS 10 is parallel to the direction of the light from the light source 1 and is emitted in the opposite direction to the direction of the light from the light source 1.

In this embodiment, the optical unit can be configured without using an imaging optical system.

Next, the Example at the time of using a transmissive rotating polyhedron for an optical unit is demonstrated.

10, 11, and 12 are plan views of a configuration diagram and a display element showing a sixth embodiment of an optical unit according to the present invention; FIGS. 10A, 11A, 12A And (b), FIG. 10 (b), FIG. 11 (b), and FIG. 12 (b) each show a place on the display element to which the R light, the G light and the B light are irradiated.

In Fig. 10A, one side of the transmissive rotating polyhedron is irradiated with R light, G light and B light having different directions of optical axes, and the R light, G light and B light are emitted from the surface opposite to the one surface. In this case, R light, G light, and B light are irradiated on the display element 12 surface to the places 12R, 12G, and 12B in order from the top, as shown in Fig. 10B. . In Fig. 11, two surfaces of the transmissive rotating polyhedron are irradiated with R light, G light and B light having different directions of optical axes, and R light, G light and B light are emitted from a surface opposite the two surfaces. In the embodiment of the present invention, as shown in Fig. 11B, the G light, the B light, and the R light are irradiated to the places 12a, 12b, and 12c in order from above. In Fig. 12A, two surfaces of the transmissive rotating polyhedron are irradiated with R light, G light and B light having different directions of optical axes, and R light, G light and B light on the surfaces opposite the two surfaces. This is an embodiment in the case where the light is emitted, and as shown in Fig. 12B, the B light, the R light, and the G light are irradiated to the places 12B, 12R, and 12G in order from the top as shown in Fig. 12B. It is becoming.

10 to 12, the light from the light source 1 passes through the first array lens 2 and the second array lens 3, and the polarized light of the light is matched in the PBS 4, for example. R dichroic mirror 7a that transmits the collimated lens 5 as S-polarized light and reflects R light, G dichroic mirror 7b that reflects G light, and B that reflects B light It is reflected as R light, G light, and B light by the dichroic mirror or the reflection mirror 7c, respectively. The R light, G light, and B light reflected by the dichroic mirror groups 7a, 7b, and 7c pass through the transmission-type rotating polyhedron 47. The R, G and B light passes through the transmissive rotating polyhedron 47 and passes through the condenser lens 8 and the first polarizing plate 9a, and then is reflected by the PBS 10 and is reflected by the λ / 4 wave plate 11. It penetrates and enters the display element 12. Each of the R light, G light, and B light reflected by the display element 12 and polarized by P-polarized light passes through the PBS 10 and is incident on the projection lens 13. In this embodiment, the direction of the light emitted from the light source 1 and the direction of the light emitted from the projection lens 13 are approximately parallel and the directions are reversed.

10 to 12, the transmissive rotating polyhedron 47 is rotated clockwise (arrow A direction) toward the drawing.

In FIG. 10, the R light, G light, and B light reflected from the dichroic mirror groups 7a, 7b, and 7c so that the optical axis directions are different from each other are incident on one side of the transmissive rotating polyhedron 47, and the transmissive rotating polyhedron After passing through the light 47 and exiting from the opposite surface of the transmissive rotating polyhedron 47, these optical axes are crossed once and then incident on the condenser lens 8.

In Fig. 11, the transmissive rotating polyhedron 47 is rotated clockwise from the case of Fig. 10, and R light and G light and B light are incident on one surface of Fig. 11, respectively, and R light and G light are respectively. And B light passes through the transmissive rotary polyhedron 47 so that the R light is emitted from the front surface different from the surface opposite to one surface, and the G light is incident from the next surface and emitted from the surface opposite to this surface. Light is incident on the next side and exits from the front side different from the side opposite to one side. In the present embodiment, the G light and the B light incident on the different planes are emitted from the different planes, and then enter the PBS 10 after crossing.

In Fig. 12, R light is incident on one surface of the transmissive rotating polyhedron 47, G light and B light are incident on the next surface, and R light, G light and B light respectively transmit the transmissive rotating polyhedron 47. Permeate. R light is emitted from the side opposite to the next face, G light is emitted from the face opposite to one face, and B light is emitted from the face opposite to the next face. The R light and the B light emitted from the surface opposite to the next surface intersect, and then pass through the condenser lens and enter the PBS 10.

10 to 12, at least two of the R light, the G light and the B light are emitted from the transmissive rotating polyhedron 47 and then intersect.

In the present embodiment, the transmissive rotating polyhedron 47 can be applied to any material as long as it is made of a material through which light is transmitted. The number of the transmissive rotating polyhedrons 47 is not limited to an octahedron, and any polygon may be applied as long as it is three or more faces, and the size of the transmissive rotating polyhedrons 47 is not limited.

As described above, according to the present invention, by using a dichroic mirror group that separates and reflects light into a plurality of colors and a rotating polyhedron to change the direction of the colors of the plurality of colors, each of the plurality of different locations on one display element is provided. Since the color can be irradiated, and the rotating polyhedron can be rotated in order to change the place where a plurality of colors are irradiated on the display element in a predetermined direction, it is possible to use one display element and Video light can be obtained.

Moreover, in this invention, since the light from a light source can be isolate | separated into many colors, and this separated many light can be irradiated to a display element efficiently, light utilization efficiency is good.

In addition, in this invention, since only one rotating polyhedron is used, the alignment of the multi-colored light irradiated on a display element is easy.

As described above, according to the present invention, a single plate type optical unit having a simple structure can be obtained. In addition, an optical unit having good light utilization efficiency can be obtained. Moreover, alignment of many colors on a display element can be performed easily.

Claims (14)

Optical unit, With a light source, An image display element for forming an optical image according to an image signal from the emitted light of the light source; A light pipe which transmits while reflecting light from the light source; A color separation system for separating light from the light pipe into first, second, and third color light; An illumination optical system irradiated with light from the color separation system and irradiated to the image display device; A projection device for projecting light emitted from the image display element as a color image, And the light pipe is configured to have polarization converting means for matching the deflection direction. The optical unit according to claim 1, wherein the light pipe has a larger area at the exit side than the entrance side. Optical unit, With a light source, An image display element for forming an optical image according to an image signal from the emitted light of the light source; A light pipe which transmits while reflecting light from the light source; A color separation system for separating light from the light pipe into first, second, and third color light; Light from the color splitter is irradiated, and is controlled by reflecting an optical axis direction of each of the first, second, and third color lights to reflect the first, second, and third color lights of the image display device. A reflective rotating polyhedron capable of irradiating the first, second, and third color light beams to one direction while simultaneously irradiating to other places; A projection device for projecting light emitted from the image display element as a color image, The said light pipe is an optical unit characterized in that the emission side has a larger area than the incident side. The optical unit according to claim 2, wherein the light emitting side of the light pipe has an exit opening, and the light incident side has an incident opening. The optical unit according to claim 3, wherein the emission side of the light pipe has an exit opening, and the entrance side has an entrance. The optical unit according to claim 4, wherein the opening shape of the light emitting side of the light pipe is substantially similar to the irradiation shape of each color light to the image display element. The optical unit according to claim 5, wherein the opening shape of the incident side surface of the light pipe is substantially similar to the shape of the light source or is substantially square. Video display device, With a light source, An image display element for forming an optical image according to an image signal from the emitted light of the light source; A light pipe which transmits while reflecting light from the light source; A color separation system for separating light from the light pipe into first, second, and third color light; An illumination optical system irradiated with light from the color separation system and irradiated to the image display device; A projection device for projecting light emitted from the image display element as a color image; With image processing circuit, Equipped with a power source, And the light pipe is configured to have polarization converting means for matching the polarization direction. 9. The video display device of claim 8, wherein the light pipe has a larger area at the exit side than the entrance side. Video display device, With a light source, An image display device for forming an optical image according to an image signal from the emitted light of the light source; A light pipe which transmits while reflecting light from the light source; A color separation system for separating light from the light pipe into first, second, and third color light; Light from the color splitter is irradiated, and is controlled by reflecting an optical axis direction of each of the first, second, and third color lights to reflect the first, second, and third color lights of the image display device. A reflective rotating polyhedron capable of irradiating the first, second, and third color light beams to one direction while simultaneously irradiating to other places; A projection device for projecting light emitted from the image display element as a color image; With image processing circuit, Equipped with a power source, And the light pipe has a larger area at the exit side than the entrance side. 10. The video display device of claim 9, wherein the emission side of the life pipe has an exit opening, and the entrance side has an entrance. The video display device of claim 10, wherein the light emitting side of the light pipe has an exit opening, and the light incident side has an incident opening. 12. The video display device of claim 11, wherein the light emitting side opening shape of the light pipe is substantially similar to the irradiation shape of each color light to the video display element. 13. The video display device of claim 12, wherein an opening shape of an incident side surface of the light pipe is substantially similar to the shape of the light source or substantially square.